From the 1930s dates this extremly shaped ladies’ watch movement, which is only 10.2mm (4 1/4 lignes) small, but 22.8mm (10 lignes) long.
Hard do believe, but watches in this extreme shape were very popular that time.
With the 15 jewels, the ETA 651 has got, all important bearings contain rubies.
It’s noteable, that the mainspring barrel has got a pretty large diameter, but there’s still unused space, which would have allowed an even larger barrel.
We have the classical gear train here, with directly driven center minute wheel, followed by the rather small third and fourth wheel and finally the steel escape wheel.
The non shock protected screw balance is made of two different metal layers, but its not slittet like a normal bimetal balance.
It beats with 18000 A/h, controls a swiss pallet lever escapement and can be adjustet with a long regulator arm.
The ETA uses of yoke winding system, of course.
If you look closely, you can see the old ETA hallmark. It was only used until the late 1930s, before it was replaced by the Ebauches Shield with ETA letters inside.
|Size:||4 1/4 x 10''' (measured: 10,2 x 22,8mm)|
|Number of jewels:||15|
bimetallic screw balance (two legs)|
|Balance bearing / direction hairspring:||Counterclockwise|
|Adjust mechanism:||Long regulator arm|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||3 hole(s)|
Ebauches: 1948 4|
Flume: 1944 76
Jacob: 1942 26